Photographic-shutter-releasing device



(No Model.)

A. M. BOOS.

PHOTOGRAPHIG SHUTTER RELEAS ING DEVICE. No; 550,475. Patented Nov. 26,1895.

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- I v ATTORNEYS.

AN BMW 5 GRAHAM. PHOTO UTNDVWASHI NGTOILDC UNITED STATES PATENT OFFICE.

ARTHUR M. BOOS, OF BOSTON, MASSACHUSETTS.

PHOTOGRAPHlC-SHUTTER-RELEASING DEVICE.

SPECIFICATION forming part of Letters Patent No. 550,475, dated November26, 1895.

Application filed April 6, 1895. Serial No. 544,744. (No model.) I

To all whom it may concern:

Be it known that I, ARTHUR M. Boos, of Boston, (Jamaica Plain,) in thecounty of Suffolk and State of Massachusetts, have invented a new andImproved Photographic- Shutter-Releasing Device, of which the' followingis a full, clear, and exact description.

The invention relates to photographic cameras; and its object is toprovide a new and improved shutter-releasing device which iscomparatively simple and durable in construction and arranged toautomatically release the shutter for time or instantaneous work toenable the photographer to be away from the camera while the exposure ismade.

The invention consists principally of a device for pressing the buttonto release the shutter, the said device being normally held out ofcontact by a fusestring.

The invention also consists of certain parts and details andcombinations of the same, as will be fully described hereinafter andthen pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a sectional side elevation of the shutter-releasing deviceon the line 1 1 of Fig. 2 and as applied. Fig. 2 is a plan view of thesame. Fig. 3 is a perspective View of the device as arranged forinstantaneous exposure. Fig. 4 is a plan view of a fuse-string used fortime exposure, and Fig. 5 is a similar View of a fuse-string forinstantaneous exposure.

The improved device is provided with a suitably-constructed frame A,secured on a camera B in the immediate neighborhood of the button usedfor releasing the shutter to make the exposure either instantaneous ortime, as the case may be.

On one arm A of the frame A is j ournaled a cam 0, provided with threepoints 0 O 0 if the device is for time exposure, as shown in Figs. 1 and2, or only with two points 0 0 as indicated in Fig. 3, when used forinstantaneous exposure. The point O, 0 or C is adapted to engage andpress the button D of the cameraBfor releasing the shutter in the mannerhereinafter more fully described.

As shown in Figs. 1 and 2, the'cam O is engaged at its point C with oneend of a cord E, passing once or twice around a pulley F, fastened tothe face of the cam C. The other end of the cord E is attached to theframe A and engages near this end a spring G, preferably in the form ofa coil-spring attached to the frame A.

On the top face of the cam O is arranged a hook H, either fastenedthereon, as shown in Fig. 1, or the point C may be formed as the hook,as indicated in Fig. 3. This hook H or point G is adapted to be engagedby a fusestring I, which for time exposureis made in the form shown inFigs. 1, 2, and 4that is, provided with two loops 1 and I of which theloop I is considerably longer than the loop I, and the rear ends of thesaid loops are adapted to be hungupon ahook A formed on the outer end ofthe frame A. The fuse end of the string I extends to one side and isknotted with the loops 1 I in such a manner that when the fuse-string islighted and burned it first unties or breaks the short loop I and aftera certain length of time burns and breaks the second loop 1 Now it willbe seen that when the several parts are in the position shown in Fig. 1and it is desired to makea time exposure the operator after lighting thefuse end of the string I can leave the camera, as the cam O is held bythe string I in the position shown in Fig. 1that is, with the point C infront of the button D and ready to press the latter whenever the cam Cis revolved. Now when the fuse-string has burned and broken the firstloop I the cam O is sufficiently released to make such rotating movementby the action of the spring G, cord E, and pulley F that the point 0presses the button D to cause the shutter to be opened for timeexposure. A further rotation of the cam O is prevented by the secondloop I now engaging the inner end of the hook H, so that the shutterremains open during the time the fuse burns from the first loop I to thesecond loop I to finally break the latter, so that a further action ofthe string G, cord E, and pulley F causes a second rotation of the cam Oto move the point C over the button D to cause the shutter to close. Incase of an in stantaneous exposure a single loop I is provided andconnected with the hook 0 as indicated in Fig. 3, it being understoodthat in this case when the loop I is broken by the fuse burning into theloop the cam O is 1'0- tated to move its point O in contact with thebutton D to press the latter for instantaneous exposure. On the arm A ofthe frame A is secured a spring J provided with a loop J, engaging theloop I, so as to hold the burning ends thereof in proper position abovethe camera to prevent'the fuse from falling upon the box, and also toprevent undue reflections of light, which might undesirably influencethe picture taken.

A guard K, attached to the frame A, extends over the button D to reducethe shock given by the point C, 0 or 0 when moving in contact with thebutton. Now it will be seen that by this arrangement the personoperating the camera may be at a short distance from the same during thetime the exposure is made, to enable the operator, for instance, to formpart of a group to be taken by the camera or to take pictures moreunobservedly than is now possible.

It is understood that any desired interval of time may be given betweenthe burning of the fuse from the first loop I to the second loop I toregulate the length of time for the exposure. It is also understood thatin the case of a time exposure such as shown in Figs. 1 and 2 the buttonD must be pressed twice to make an exposure-that is, once to open theshutter and the second time for closing it.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent- 1. A shutter releasing device for cameras,provided with a button pressing device adapted to press the button forreleasing the shutter, and a fuse string for normally holding the saidbutton pressing device out of contact with the button, substantially asshown and described.

2. A shutter releasing device for cameras, comprising a cam for pressingthe button, means for rotating the said cam, and a fuse string engagingthe said cam, to hold the latter normally out of contact with thebutton, substantially as shown and described.

3. A shutter releasing device for cameras, comprising a cam, a cord andpulley connected with the said cam, a spring pressing on the said cord,and a fuse string provided with a loop attached to a fixed part andconnected with the said cam, to hold the latter in a normal position;that is, out of contact with the button, substantially as shown and tonfor releasing the shutter, means for rotating said cam, and means forholding said cam against rotative movement, substantially as set forth.

ARTHUR M. BOOS.

Witnesses:

GEORGE. J. FENEIRA, DAVID FLOYD, 2d.

